EP1296201A1 - Méthode de formation d'images et toner associé - Google Patents

Méthode de formation d'images et toner associé Download PDF

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Publication number
EP1296201A1
EP1296201A1 EP02021033A EP02021033A EP1296201A1 EP 1296201 A1 EP1296201 A1 EP 1296201A1 EP 02021033 A EP02021033 A EP 02021033A EP 02021033 A EP02021033 A EP 02021033A EP 1296201 A1 EP1296201 A1 EP 1296201A1
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EP
European Patent Office
Prior art keywords
toner
image
forming method
image forming
toner image
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02021033A
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German (de)
English (en)
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EP1296201B1 (fr
Inventor
Mituo Aoki
Kumi Hasegawa
Toshiaki Higaya
Yasushi Koichi
Yutaka Takahashi
Tadashi Kasai
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Ricoh Co Ltd
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Ricoh Co Ltd
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Priority claimed from JP2001288497A external-priority patent/JP4208223B2/ja
Priority claimed from JP2001288510A external-priority patent/JP4647160B2/ja
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Publication of EP1296201A1 publication Critical patent/EP1296201A1/fr
Application granted granted Critical
Publication of EP1296201B1 publication Critical patent/EP1296201B1/fr
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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08784—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775
    • G03G9/08797—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775 characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G13/00—Electrographic processes using a charge pattern
    • G03G13/20—Fixing, e.g. by using heat
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/0819—Developers with toner particles characterised by the dimensions of the particles
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/0821—Developers with toner particles characterised by physical parameters
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08742—Binders for toner particles comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • G03G9/08755—Polyesters
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08784—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775
    • G03G9/08793—Crosslinked polymers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08784—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775
    • G03G9/08795—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775 characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants

Definitions

  • This invention relates to an image forming method in which toner images are formed by developing an electrostatic latent image by, for example, electrophotography, electrostatic recording or electrostatic printing, and to a toner useful for the image forming method.
  • the heating roller fixing method has problems because a large thermal energy is absorbed by the transfer sheet such as paper during the contact of the image-bearing sheet with the heating roller.
  • the preset temperature of the heating roller is low, the temperature of the surface of the heating roller is apt to decrease to bring about insufficient fixation of the toner image on the sheet.
  • Such insufficient fixation will not occur when the preset temperature of the heating roller is high.
  • the toner melted upon contact with the heating roller has so low a viscosity that the reproducibility of the fixed toner image is lowered especially in fine line portions thereof.
  • Various toners have been proposed for use in an image forming method utilizing a heating roller fixing method. Japanese Patent No.
  • H07-72809 discloses a toner containing a styrene-acrylate copolymer resin having specifically controlled temperature dependency of the melt viscosity thereof.
  • Japanese Laid Open Patent Publication No. H10-246989 proposes a toner containing a specific charge controlling agent and having a specific temperature dependency of the average viscosity.
  • Japanese Laid Open Patent Publication No. H08-220793 discloses a toner having a specific voidage
  • H08-278659 discloses a toner having a specific particle size distribution and a specific voidage
  • H10-48874 discloses a toner containing a silicone compound and an inorganic powder and having a specific particle size distribution and a specific voidage.
  • Japanese Laid Open Patent Publication No. H06-230602 proposes a magnetic toner which gives a toner image having a specific ratio of the height thereof before fixation to the height thereof after fixation.
  • the problem to be solved by the Japanese publication is to prevent offset and other troubles during duplex copying and is not concerned with improvement of image quality.
  • the present invention has been made in view of the above problems.
  • an image forming method comprising passing a toner image-bearing sheet through a nip defined between two rollers including a heater roller to fix the toner image on said sheet, wherein said toner image is formed from a toner comprising a binder resin, a wax and a colorant, wherein the toner image before the passage through said nip has a toner volume V1 and a toner image area S1, wherein the toner image after the passage through said nip has a toner volume V2 and a toner image area S2, and wherein a volume change Vt and an area change St defined by the formulas shown below are 30 % or less and 20 % or less, respectively:
  • the present invention also provides a toner cartridge containing the above toner.
  • an image forming apparatus which may be a digital copying machine, employs a well-known electrographic system and has a drum-shaped photoconductor 1.
  • a charger 2 Around the photoconductor 1, a charger 2, exposure means 3, developing means 4, transfer means 5, and cleaning means 6 for performing electrographic copying process are disposed along the rotating direction of the photoconductor 1 shown by the arrow A.
  • Reading means 8 reads an original image placed on a table 7 disposed on an upper side of the copying machine as an image signal and the exposure means 3 forms an electrostatic latent image on the photoconductor 1 based on the image signal.
  • the electrostatic latent image formed on the photoconductor 1 is developed into a toner image by the developing means 4 and the toner image is electrostatically transferred onto a transfer paper fed from a paper supply unit 9 by the transfer means 5.
  • the transfer paper bearing the toner image is transported to fixing means 10 and discharged after the toner image has been fixed thereon.
  • FIG. 2 A suitable fixing means for use in the present invention is illustrated in FIG. 2.
  • the fixing means shown in FIG. 2 is a heating roller fixing device in which a developed toner image is fixed by passing through a nipped section of two rollers.
  • the reference numeral 11 denotes a fixing roller (heating roller)
  • numeral 12 denotes a pressure roller.
  • the fixing roller 11 includes a metal cylinder 13 made of a heat conductive metal such as aluminum, iron, stainless steel or brass, and an offset preventing layer 14 covering the metal cylinder 13 and made of, for example, a room temperature vulcanizing (RTV) rubber, silicone rubber, a tetrafluoroethylene-perfluoroalkylvinylether copolymer (PFA), or a polytetrafluoroethylene (PTFE).
  • RTV room temperature vulcanizing
  • PFA tetrafluoroethylene-perfluoroalkylvinylether copolymer
  • PTFE polytetrafluoroethylene
  • the pressure roller 12 has a metal cylinder 16 made of the same metal as the metal cylinder 13 of the fixing roller 11, and an offset preventing layer 17 made of PFA, PTFE or the like.
  • a heat lamp 18 may be arranged in the pressure roller 12.
  • the fixing roller 11 and the pressure roller 12 are in a pressure engagement with each other by a pressing member such as springs (not shown), so that the two rollers rotate in the direction opposite directions.
  • FIG. 3 Another preferred embodiment of a heating roller fixation device is shown in FIG. 3.
  • the reference numeral 21 denotes a fixing roller (heating roller), and numeral 25 denotes a pressure roller.
  • the fixing roller 21 includes a base cylinder 30 made of a heat conductive metal such as aluminum, iron, stainless steel or brass, an elastic layer 22 covering the base cylinder 30 and made of, for example, a silicone rubber, and an offset preventing layer 23 covering the elastic layer 22 and made of a releasing material such as a room temperature vulcanizing (RTV) rubber, a silicone rubber, tetrafluoroethylene-perfluoroalkylvinylether copolymer (PFA) or a polytetrafluoroethylene (PTFE).
  • RTV room temperature vulcanizing
  • PFA tetrafluoroethylene-perfluoroalkylvinylether copolymer
  • PTFE polytetrafluoroethylene
  • the thickness of the elastic layer 22 is preferably 100-500 ⁇ m for reasons of formation of high grade fixed images and of suitable heat conductivity, while the thickness of the offset preventing layer 23 is preferably 10-50 ⁇ m for reasons of suitable heat conductivity and service life.
  • a heater such as a halogen lamp.
  • a temperature detector 29 is provided for measuring the temperature of the surface of the fixing roller 21. The temperature detector 29 is coupled with the heater 24 through a controller so that the temperature of the fixing roller 21 is maintained at a predetermined range.
  • the image forming method includes passing a sheet S having a toner image T formed from a toner including a binder resin and a colorant through the nip between the rollers 1 and 2 in the case of FIG. 2 or rollers 21 and 25 in the case of FIG. 3 so that the toner image T is melted and fixed to the sheet S to form a fixed toner image thereon.
  • Vt and an area change St defined by the formulas shown below should be 30 % or less and 20 % or less, respectively:
  • toner volume change Vt is greater than 30 %, a suitable toner image density is not obtainable especially in half tone image portions such as dot image portions in which the amount of the toner is relatively small.
  • the toner image area change St is greater than 20 %, the image quality is deteriorated especially in solid image portions in which the amount of the toner is relatively large.
  • the area and volume of a toner image before and after the passage through the rollers are measured using a microscope (Color Laser 3D Profile Microscope VK-8500).
  • a circular solid image (before passage through the rollers) formed from a plurality of dots and having a diameter of 2.0 mm and a deposition amount of the toner of 1.2 ⁇ 0.05 mg is observed by the microscope to determine the total area of the dots.
  • the height of the toner image before the passage through the rollers is also measured.
  • the toner volume is calculated on the basis of the height and the total area of the dots thus measured.
  • the circular solid image is then passed through the rollers.
  • the total area of the dots and the height of the toner image after the passage through the rollers are measured, from the results of which the toner volume is calculated.
  • the fixation efficiency of small diameter toner is not high because a pressure is not easily applied to the toner particles during fixation step.
  • a high pressure is applied to improve the fixation efficiency, the toner image is crushed to cause deterioration of the image.
  • the volume change Vt and the area change St are 30 % or less and 20 % or less, respectively, high grade images (with small granularity) may be produced with high fixation efficiency.
  • the fixing pressure surface pressure
  • the hardness of the rollers thereof and the thickness of the toner image bearing sheet but also the composition and physical properties of the toner play an important role in controlling the volume change Vt and the area change St.
  • melt viscosity the content of tetrahydrofuran (THF) insolubles
  • the acid value of the toner binder a magnetic material, an inorganic fine powder and an organozirconium compound of the toner have been found to have an influence upon the volume change Vt and the area change St.
  • At least one of two rollers of the heating roller fixation device have an elastic layer for reasons of easiness in controlling the fixing pressure (surface pressure) and of ensuring the suitable volume change Vt and the area change St.
  • the toner used in the image forming method of the present invention have a ratio ⁇ 100 / ⁇ 120 of the viscosity ⁇ 100 of the toner at 100°C to the viscosity ⁇ 120 of the toner at 120°C ranges from 6 to 10 for reasons of attainment of the suitable volume change Vt and the area change St and the suitable fixation efficiency.
  • the melt viscosity ⁇ 100 at 100°C is preferably in the range of 1 ⁇ 10 5 to 4 ⁇ 10 5 Pa ⁇ s and the melt viscosity ⁇ 120 at 120°C is preferably in the range of 1 ⁇ 10 4 to 4 ⁇ 10 5 Pa ⁇ s for reasons of attainment of the suitable volume change Vt and the area change St and the suitable fixation efficiency.
  • the melt viscosity of the toner is measured using a commercially available flow tester "CFT-500C" made by Shimadzu Corporation. The measuring conditions are as follows:
  • the binder resin of the toner have a THF-insoluble content of 10 to 80 % by weight for reasons of attainment of the suitable volume change Vt and the area change St and the suitable fixation efficiency.
  • a polyester resin which permits fixation at a lower temperature while maintaining suitable heat resistance and preservability as compared with other resins is suitably used as a binder resin of the toner of the present invention.
  • the binder resin comprise at least 50 % by weight of a polyester resin having an acid value of 10 to 100 mgKOH/mg for reasons of stable chargeability, compatibility with other ingredients of the toner, dispersibility in the toner and small environment denpendency of the charge amount of the toner.
  • Suitable polyester resins for use in the toner of the present invention include those which are prepared by condensation polymerization of an alcohol and a carboxylic acid.
  • Specific examples of such alcohols for use in the polyester resins include glycols such as ethylene glycol, diethylene glycol, triethylene glycol and propylene glycol; 1,4-bis(hydroxymetha)cyclohexane, etherificated bisphenols such as bisphenol A, dihydric alcohol monomers, and polyhydric alcohol monomers.
  • carboxylic acids for use in the polyester resins include organic dibasic acid monomers such as maleic acid, fumaric acid, phthalic acid, isophthalic acid, terephthalic acid, succinic acid, malonic acid; and polybasic carboxylic acid monomers such as 1,2,4-benzenetricarboxylic acid, 1,2,5-benzenetricarboxylic acid, 1,2,4-cyclohexanetricarboxylic acid, 1,2,4-naphthalenetricarboxylic acid, 1,2,5-hexanetricarboxylic acid, 1,3-dicarboxyl-2-methylenecarboxylpropane, and 1,2,7,8-octanetetracarboxylic acid.
  • organic dibasic acid monomers such as maleic acid, fumaric acid, phthalic acid, isophthalic acid, terephthalic acid, succinic acid, malonic acid
  • polybasic carboxylic acid monomers such as 1,2,4-benzenetricarbox
  • the polyester resin may be employed in conjunction with one or more other resins.
  • resins include homopolymers or copolymers of styrene or its homologues such as polystyrene, poly- ⁇ -methylstyrene, styrene-chlorostyrene copolymers, styrene-propylene copolymers, styrene-butadiene copolymers, styrene-vinyl chloride copolymers, styrene-vinyl acetate copolymers, styrenemaleic acid copolymers, styrene-acrylate copolymers, styrene-methacrylate copolymers, styrene- ⁇ -chloroacrylic acid methyl ester copolymers, and styrene-acrylonitrile-acrylate copolymers; vinyl chloride resins, rosin modified
  • the toner according to the present invention contain inorganic powder such as silica, aluminum oxide or titanium oxide as an internal additive for reasons of obtaining a filler effect and a reduction of the volume change Vt and area change St.
  • the average particle size of the inorganic powder is generally in the range of 0.001 to 1 ⁇ m, preferably 0.005 to 0.1 ⁇ m. Such particles may be combined to form secondary particles, if desired.
  • the inorganic powder is generally used in an amount of 0.1 to 10 % by weight, preferably 0.2 to 5 % by weight, based on the weight of the toner.
  • the toner of the present invention may preferably contain a charge controlling agent such as a nigrosine dye, a quarternary ammonium salt, an amino group-containing polymer, a metal-containing azo dye, a complex containing salicylic acid group or a phenol compound.
  • a charge controlling agent such as a nigrosine dye, a quarternary ammonium salt, an amino group-containing polymer, a metal-containing azo dye, a complex containing salicylic acid group or a phenol compound.
  • the organic zirconium compound is preferably a compound represented by the following formula: wherein R1 represents a quarternary carbon atom, a metyne group or a methylene group which may contain a heteroatom such as N, S, O or P, Y contains one or more saturated and/or unsaturated bonds which define, together with R1, a ring fused to the benzene ring of the above formula, R2 and R3 are independently selected from alkyl, alkenyl, alkoxy, aryl which may contain one or more substituents, aryloxy which may contain one or more substituents, aralkyl which may contain one or more substituents, aralkyloxy which may contain one or more substituents, halogene, hydrogen, hydroxyl, amino which may contain one or more substituents, carboxyl, carbonyl, nitro, nitroso, sulfonyl and cyano, R4 represents a hydrogen atom or an alkyl group, 1 is an integer of
  • Inorganic fine particles may be suitably used, as an external additive, to improve the fluidity, developing efficiency and chargeability of the toner by being attached to outer surfaces of the toner particles.
  • Such inorganic fine particles include silica, alumina, titanium oxide, barium titanate, magnesium titanate, calcium titanate, strontium titanate, zinc oxide, quartz sand, clay, mica, wallstonite, diatomaceous earth, chromium oxide, cerium oxide, iron oxide red, antimony trioxide, magnesium oxide, zirconium oxide, barium sulfate, barium carbonate, calcium carbonate, silicon carbide and silicon nitride.
  • Suitable surface treating agents include silane coupling agents, silane coupling agents having a fluorinated alkyl group, organic titanate type coupling agents, aluminum type coupling agents, silicone oil and modified silicone oil.
  • the toner contain a wax to improve the release properties of toner images from a heating roller of the fixation device.
  • suitable waxes are polyolefin waxes such as propylene wax and polyethylene wax and vegetable waxes such as candelilla wax, carnauba wax and rice wax.
  • the amount of the wax is generally 0.5 to 10 % by weight based on the weight of the binder resin.
  • the toner of the present invention can be prepared by any conventionally-known method such as a pulverization method in which a kneaded mixture containing ingredients of the toner is solidified and ground.
  • the ingredients may be suitably blended using a Henschel mixer or the like before kneading.
  • the thus obtained kneaded mixture is cooled and ground.
  • the grinding may be performed by a combination of a coarse pulverization with a hammer mill, Rotoplex (a grinder manufactured by Hosokawa Micron Co., Ltd.) or the like and succeeding fine pulverization with a jet air pulverizer or a mechanical pulverizer.
  • the toner will be adjusted to have a desired particle size distribution by an air classifier or the like.
  • any conventionally-known carrier can be used.
  • the toner is generally used in an amount of 1-10 parts by weight per 100 parts by weight of the carrier.
  • suitable carrier are powders of glass, iron, ferrite, nickel, zircon or silica, which have a particle diameter of from 30 to 1000 ⁇ m. These powders may be coated with a resin such as a styrene-acrylate copolymer, a silicone resin, a polyamide resin or a polyvinylidene fluoride resin.
  • a sheet S having a toner image T formed from a toner including a binder resin and a colorant is passed through the nip between the rollers 1 and 2 in the case of FIG. 2 or rollers 21 and 25 in the case of FIG. 3 so that the toner image T is melted and fixed to the sheet S to form a fixed toner image thereon.
  • toner image T before the passage through the nip preferably has a surface roughness of 2.5 ⁇ m or less for reasons of uniformity of the image density and gloss.
  • the reference length L of 0.8 mm is employed.
  • At least one of the two rollers of the heating roller fixing device used for carrying out the method according to the second aspect of the present invention is elastic for reasons of improved fixation efficiency and of uniformity of the image density and gloss.
  • the toner image before the passage through said nip preferably has a surface roughness of 2.0 ⁇ m or less for the same reasons.
  • the toner used in the second aspect of the present invention have an average sphericity of at least 0.92, more preferably at least 0.95 for reasons of obtaining small surface roughness Ra and low granularity.
  • the sphericity of the toner particles may be increased by grinding or by a heat treatment.
  • the sphericity as used herein is measured using a flow particle image analyzer, "FPIA-2100", manufactured by SYSMEX Co., Ltd.).
  • a 1 % NaCl aqueous solution (50 to 100 ml) after being passed through a 0.45 ⁇ m filter is mixed with 0.1 to 5 ml of a surfactant (preferably a salt of alkylbenzenesulfonate).
  • a surfactant preferably a salt of alkylbenzenesulfonate
  • 1 to 10 mg of a sample is added. This is subjected to a dispersion treatment for 1 minute with an ultrasonic disperser to form a sample dispersion liquid having a concentration of 5000 to 15000 particles/ ⁇ l.
  • the toner used in the second aspect of the present invention have a bulk density of at least 0.30 g/cm 3 for reasons of obtaining suitable surface roughness Ra of the toner image before the fixation.
  • the bulk density of the toner is measured using a powder tester (model PTN manufactured by Hosokawa Micron Inc.).
  • the toner used in the image forming method according to the second aspect of the present invention contain inorganic powder such as silica, aluminum oxide or titanium oxide as an internal additive for reasons of obtaining a filler effect.
  • the average particle size of the inorganic powder is generally in the range of 0.001 to 1 ⁇ m, preferably 0.005 to 0.1 ⁇ m. Such particles may be combined to form secondary particles, if desired.
  • the inorganic powder is generally used in an amount of 0.1 to 5 % by weight, preferably 0.2 to 2 % by weight, based on a total weight of the toner.
  • the above components were mixed using a two axis kneader at 40°C.
  • the kneaded mixture was cooled, pulverized and classified.
  • the thus obtained mother toner had a weight average particle diameter of 10.5 ⁇ m.
  • Toner (1) 0.4 part of hydrophobic silica (R972 manufactured by Clariant Japan) as an external additive was mixed using Henschel mixer to obtain Toner (1).
  • the Toner (1) was then mixed with a carrier which was obtained by coating ferrite particles having an average particle diameter of 80 ⁇ m with a silicone resin to obtain a Developer (1) having a toner content of 4 % by weight.
  • a heating roller fixation device as shown in FIG. 3 is mounted on a commercially available copying machine (IMAGIO MF6550 manufactured by Ricoh Company, Ltd.) to which the Developer (1) was charged.
  • the fixation efficiency is measured by the following method.
  • Example 1 Using the above composition, the procedures of Example 1 were repeated in the same manner as described except that the kneading temperature was increased to 90°C.
  • the thus obtained toner (Toner C3) was measured for the melt viscosity ⁇ 100 , melt viscosity ⁇ 120 , the volume change Vt, the area change St, the fixation efficiency and the granularity in the same manner as that described in Example 1 except that a heating roller fixation device (surface pressure: 1.0 ⁇ 10 5 Pa ⁇ s) as shown in FIG. 2 was substituted for the fixation device as shown in FIG. 3.
  • the results are shown in Table 1.
  • Table 1 The results are shown in Table 1.
  • Example 1 Using the above composition, the procedures of Example 1 were repeated in the same manner as described except that the kneading temperature was increased to 60°C. The thus obtained toner (Toner C6) was measured for the melt viscosity ⁇ 100 , melt viscosity ⁇ 120 , the volume change Vt, the area change St, the fixation efficiency and the granularity in the same manner as that described in Example 1. The results are shown in Table 1.
  • Styrene-butyl acrylate copolymer (weight average molecular weight: 350,000) 50 parts Styrene-n-butyl methacrylate copolymer (weight average molecular weight: 39,000) 33 parts Carbon black (trade name: #44, manufactured by Mitsubishi Chemical Corp.) 10 parts Charge controlling agent (trade name: Spiron Black TR-H, manufactured by Hodogaya Chemical Corp.) 2 parts Carnauba wax 5 parts
  • the thus obtained toner was measured for the melt viscosity ⁇ 100 , melt viscosity ⁇ 120 , the volume change Vt, the area change St, the fixation efficiency and the granularity in the same manner as that described in Example 1. The results are shown in Table 1.
  • Styrene-butyl acrylate copolymer (weight average molecular weight: 280,000) 53 parts Styrene-2-ethylhexyl acrylate-n-butyl methacrylate terpolymer (weight average molecular weight: 31,000) 30 parts Carbon black (trade name: #44, manufactured by Mitsubishi Chemical Corp.) 10 parts Charge controlling agent (trade name: Spiron Black TR-H, manufactured by Hodogaya Chemical Corp.) 2 parts Carnauba wax 5 parts
  • the above components were mixed using a two axis kneader at 100°C.
  • the kneaded mixture was cooled, pulverized and classified.
  • the thus obtained mother toner had a weight average particle diameter of 10.5 ⁇ m.
  • Toner (3) 0.4 part of hydrophobic silica (R972 manufactured by Clariant Japan) as an external additive was mixed using Henschel mixer to obtain Toner (3).
  • the Toner (3) was then mixed with a carrier which was obtained by coating ferrite particles having an average particle diameter of 80 ⁇ m with a silicone resin to obtain a Developer (3) having a toner content of 4 % by weight.
  • Example 4 Polyester resin (weight average molecular weight: 182,000, THF insoluble content: 20 % by weight, acid value: 3 mgKOH/mg) 68 parts Polyester resin (weight average molecular weight: 53,000, THF insoluble content: 0, acid value: 5 mgKOH/mg) 15 parts Carbon black (trade name: #44, manufactured by Mitsubishi Chemical Corp.) 10 parts Charge controlling agent (trade name: Spiron Black TR-H, manufactured by Hodogaya Chemical Corp.) 2 parts Rice wax 5 parts
  • the thus obtained toner was measured for the melt viscosity ⁇ 100 , melt viscosity ⁇ 120 , the volume change Vt, the area change St, the fixation efficiency and the granularity in the same manner as that described in Example 1. The results are shown in Table 1.
  • Polyester resin weight average molecular weight: 75,000, THF insoluble content: 40 % by weight
  • Styrene-butyl acrylate copolymer weight average molecular weight: 71,000, THF insoluble content: 25 % by weight
  • Hydrophobic silica R972 manufactured by Clariant Japan
  • Carbon black trade name: #44, manufactured by Mitsubishi Chemical Corp.
  • Charge controlling agent trade name: Spiron Black TR-H, manufactured by Hodogaya Chemical Corp.
  • the thus obtained toner was measured for the melt viscosity ⁇ 100 , melt viscosity ⁇ 120 , the volume change Vt, the area change St, the fixation efficiency and the granularity in the same manner as that described in Example 1. The results are shown in Table 1.
  • Polyester resin weight average molecular weight: 142,000, THF insoluble content: 10 % by weight
  • Styrene-butyl acrylate copolymer weight average molecular weight: 45,000, THF insoluble content: 15 % by weight
  • Hydrophobic silica R972 manufactured by Clariant Japan
  • Carbon black trade name: #44, manufactured by Mitsubishi Chemical Corp.
  • Charge controlling agent trade name: Spiron Black TR-H, manufactured by Hodogaya Chemical Corp.
  • the above components were mixed using a two axis kneader at 90°C.
  • the kneaded mixture was cooled, pulverized and classified.
  • the thus obtained mother toner had a weight average particle diameter of 10.5 ⁇ m.
  • 0.4 part of hydrophobic silica (R972 manufactured by Clariant Japan) as an external additive was mixed using Henschel mixer to obtain Toner (6).
  • the Toner (6) was then mixed with a carrier which was obtained by coating ferrite particles having an average particle diameter of 80 ⁇ m with a silicone resin to obtain a Developer (6) having a toner content of 4 % by weight.
  • Example 7 Polyester resin (weight average molecular weight: 182,000, THF insoluble content: 5 % by weight, acid value: 35 mgKOH/mg) 68 parts Polyester resin (weight average molecular weight: 53,000, THF insoluble content: 0, acid value: 5 mgKOH/mg) 15 parts Carbon black (trade name: #44, manufactured by Mitsubishi Chemical Corp.) 10 parts Charge controlling agent (trade name: Spiron Black TR-H, manufactured by Hodogaya Chemical Corp.) 2 parts Rice wax 5 parts
  • the above components were mixed using a two axis kneader at 60°C.
  • the kneaded mixture was cooled, pulverized and classified.
  • the thus obtained mother toner had a weight average particle diameter of 10.5 ⁇ m.
  • 0.4 part of hydrophobic silica (R972 manufactured by Clariant Japan) as an external additive was mixed using Henschel mixer to obtain Toner (7).
  • the Toner (7) was then mixed with a carrier which was obtained by coating ferrite particles having an average particle diameter of 80 ⁇ m with a silicone resin to obtain a Developer (7) having a toner content of 4 % by weight.
  • Example 8 Polyester resin (weight average molecular weight: 182,000, THF insoluble content: 20 % by weight) 63 parts Styrene-butyl acrylate copolymer (weight average molecular weight: 71,000, THF insoluble content: 25 % by weight) 20 parts Hydrophobic silica (R972 manufactured by Clariant Japan) 3 parts Carbon black (trade name: #44, manufactured by Mitsubishi Chemical Corp.) 10 parts Charge controlling agent (trade name: Spiron Black TR-H, manufactured by Hodogaya Chemical Corp.) 2 parts Carnauba wax 5 parts
  • the above components were mixed using a two axis kneader at 120°C.
  • the kneaded mixture was cooled, pulverized and classified.
  • the thus obtained mother toner had a weight average particle diameter of 10.5 ⁇ m.
  • 0.4 part of hydrophobic silica (R972 manufactured by Clariant Japan) as an external additive was mixed using Henschel mixer to obtain Toner (8).
  • the Toner (8) was then mixed with a carrier which was obtained by coating ferrite particles having an average particle diameter of 80 ⁇ m with a silicone resin to obtain a Developer (8) having a toner content of 4 % by weight.
  • Styrene-butyl acrylate copolymer (weight average molecular weight: 280,000) 45 parts Styrene-2-ethylhexyl acrylate-n-butyl methacrylate terpolymer (weight average molecular weight: 31,000) 15 parts Magnetic material (EPT-1000 manufactured by Toda Kogyou Co., Ltd.) 30 parts Carbon black (trade name: #44, manufactured by Mitsubishi Chemical Corp.) 5 parts Charge controlling agent (trade name: Spiron Black TR-H, manufactured by Hodogaya Chemical Corp.) 2 parts Carnauba wax 3 parts
  • the thus obtained toner was measured for the melt viscosity ⁇ 100 , melt viscosity ⁇ 120 , the volume change Vt, the area change St, the fixation efficiency and the granularity in the same manner as that described in Example 1. The results are shown in Table 1.
  • Example 11 Polyester resin (weight average molecular weight: 182,000, THF insoluble content: 30 % by weight, acid value: 55 mgKOH/mg) 83 parts Carbon black (trade name: #44, manufactured by Mitsubishi Chemical Corp.) 10 parts Charge controlling agent (organozirconium compound) 2 parts Carnauba wax 5 parts
  • the above components were mixed using a two axis kneader at 130°C.
  • the kneaded mixture was cooled, pulverized and classified.
  • the thus obtained mother toner had a weight average particle diameter of 10.5 ⁇ m.
  • Toner (11) 0.4 part of hydrophobic silica (R972 manufactured by Clariant Japan) as an external additive was mixed using Henschel mixer to obtain Toner (11).
  • the Toner (11) was then mixed with a carrier which was obtained by coating ferrite particles having an average particle diameter of 80 ⁇ m with a silicone resin to obtain a Developer (11) having a toner content of 4 % by weight.
  • Example 12 Polyester resin (weight average molecular weight: 182,000, THF insoluble content: 30 % by weight, acid value: 55 mgKOH/mg) 83 parts Carbon black (trade name: #44, manufactured by Mitsubishi Chemical Corp.) 10 parts Charge controlling agent (organozirconium compound) 2 parts Carnauba wax 5 parts
  • the above components were mixed using a two axis kneader at 130°C.
  • the kneaded mixture was cooled, pulverized and classified.
  • the thus obtained mother toner had a weight average particle diameter of 10.5 ⁇ m.
  • Toner (12) 1.5 parts of hydrophobic silica (R972 manufactured by Clariant Japan) as an external additive was mixed using Henschel mixer to obtain Toner (12).
  • the Toner (12) was then mixed with a carrier which was obtained by coating ferrite particles having an average particle diameter of 80 ⁇ m with a silicone resin to obtain a Developer (12) having a toner content of 4 % by weight.
  • Example 13 Polyester resin (weight average molecular weight: 182,000, THF insoluble content: 20 % by weight) 63 parts Styrene-butyl acrylate copolymer (weight average molecular weight: 71,000, THF insoluble content: 25 % by weight) 20 parts Carbon black (trade name: #44, manufactured by Mitsubishi Chemical Corp.) 10 parts Charge controlling agent (trade name: Spiron Black TR-H, manufactured by Hodogaya Chemical Corp.) 2 parts Carnauba wax 5 parts
  • the above components were mixed using a two axis kneader at 120°C.
  • the kneaded mixture was cooled, pulverized and classified.
  • the thus obtained mother toner had a weight average particle diameter of 10.5 ⁇ m.
  • Toner particles 1.5 parts of hydrophobic silica (R972 manufactured by Clariant Japan) as an external additive was mixed using Henschel mixer to obtain Toner (13).
  • the Toner (13) was then mixed with a carrier which was obtained by coating ferrite particles having an average particle diameter of 80 ⁇ m with a silicone resin to obtain a Developer (13) having a toner content of 4 % by weight.
  • the thus obtained toner was measured for the melt viscosity ⁇ 100 , melt viscosity ⁇ 120 , the volume change Vt, the area change St, the fixation efficiency and the granularity in the same manner as that described in Example 1. The results are shown in Table 1.
  • the above components were mixed using a two axis kneader.
  • the kneaded mixture was cooled, pulverized and classified.
  • hydrophobic silica R972 manufactured by Clariant Japan
  • the toner was then mixed with a carrier which was obtained by coating ferrite particles having an average particle diameter shown in Tables 2-1 through 2-3 with a silicone resin to obtain a developer having a toner content as shown in Tables 2-1 through 2-3.
  • the toner was measured for the average sphericity, bulk density, weight average particle diameter Xw and number average particle diameter Xn.
  • a heating roller fixation device as shown in FIG. 2 is mounted on a commercially available copying machine (IMAGIO MF6550 manufactured by Ricoh Company, Ltd.) to which the sample developer is charged. Images of a standard printer test chart are formed with the copying machine operated at a developer charging amount and a bias voltage as shown in Tables 2-1 through 2-3. The developed image is transferred to a transfer paper either in a non-contact method using a charger or a contact method using a belt as shown in Tables 2-1 through 2-3. The transferred image before fixation is measured for the surface roughness Ra using a microscope (Color Laser 3D Profile Microscope VK-8500 manufactured by Keyence Corp.) in accordance with JIS B0601.
  • a microscope Color Laser 3D Profile Microscope VK-8500 manufactured by Keyence Corp.
  • Example 14 15 16 17 18 Average diameter of carrier ( ⁇ m) 50 50 50 50 50 Content of toner in developer (wt. %) 4.5 4.0 3.0 5.0 5.5 Charging amount of developer ( ⁇ c/g) -33 -42 -48 -30 -35 Bias DC voltage -500 -520 -600 -630 -550 Surface roughness Ra ( ⁇ m) 2.0 1.3 1.2 1.7 1.8 Average sphericity 0.90 0.92 0.89 0.94 0.88 Bulk density (g/cm 3 ) 0.28 0.26 0.32 0.35 0.25 Amount of external additive (wt.%) 0.5 0.8 2.2 1.2 0.4 Xw/Xn 1.5 1.4 1.6 1.3 Xw ( ⁇ m) 10.5 10.5 11.0 10.5 10.5 10.5 10.5 10.5 10.5 10.5 Transfer method charger charger charger charger charger Granularity 0.60 0.55 0.48 0.44 0.46 Fixation efficiency (°C) 145 145 140 135 140 Example 19 20 21 22 23 Average diameter of carrier ( ⁇ m) 50 80 80 50
  • a heating roller fixation device as shown in FIG. 3 is mounted on a commercially available copying machine (IMAGIO MF6550 manufactured by Ricoh Company, Ltd.) to which the sample developer is charged. Images of a standard printer test chart are formed with the copying machine operated at a developer charging amount and a bias voltage as shown in Tables 3-1 through 3-3. The developed image is transferred to a transfer paper either in a non-contact method using a charger or a contact method using a belt as shown in Tables 2-1 through 2-3. The transferred image before fixation is measured for the surface roughness Ra using a microscope (Color Laser 3D Profile Microscope VK-8500 manufactured by Keyence Corp.) in accordance with JIS B0601.
  • a microscope Color Laser 3D Profile Microscope VK-8500 manufactured by Keyence Corp.
  • Example 25 26 27 28 29 Average diameter of carrier ( ⁇ m) 50 50 50 80 80 Content of toner in developer (wt. %) 4.5 5.5 6.0 2.5 3.0 Charging amount of developer ( ⁇ c/g) -38 -40 -32 -33 -35 Bias DC voltage -620 -550 -530 -560 -550 Surface roughness Ra ( ⁇ m) 2.5 2.0 1.9 1.7 2.4 Average sphericity 0.89 0.93 0.90 0.91 0.92 Bulk density (g/cm 3 ) 0.27 0.25 0.22 0.26 0.30 Amount of external additive (wt.%) 0.3 0.5 3.1 1.0 3.0 Xw/Xn 1.6 1.4 1.5 1.7 1.4 Xw ( ⁇ m) 11.0 10.5 9.5 8.0 7.5 Transfer method charger charger charger charger charger Granularity 0.60 0.57 0.56 0.52 0.45 Fixation efficiency (°C) 140 145 140 135 135 Example 30 31 32 33 34 Average diameter of carrier ( ⁇ m) 50 50 80 50 50 50 Content of toner in developer (w

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1522900A1 (fr) * 2003-10-08 2005-04-13 Ricoh Company, Ltd. Toner et révélateur,ainsi que procédé et appareil de production d' images utilisant ledit révélateur
EP1744221A1 (fr) * 2005-07-13 2007-01-17 Ricoh Company, Ltd. Encre en poudre, processus de production de celle-ci et procédé de formation d'image
EP1764656A1 (fr) * 2005-09-14 2007-03-21 Ricoh Company, Ltd. Toner, procédé de fabrication, procédé de formation d'images l'utilisant, révélateur, récipient de toner, cartouche de traitement et appareil de formation d'images
CN100555089C (zh) * 2003-10-08 2009-10-28 株式会社理光 调色剂和显影剂以及使用该显影剂的成像方法和装置

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3905048B2 (ja) * 2003-03-17 2007-04-18 株式会社リコー 静電荷像現像用トナー、プロセスカートリッジ、定着方法、画像形成方法、及び画像形成装置
US7642032B2 (en) 2003-10-22 2010-01-05 Ricoh Company, Limited Toner, developer, image forming apparatus and image forming method
US7457570B2 (en) 2004-08-06 2008-11-25 Ricoh Company, Ltd. Image forming apparatus including a magnetic brush developing system using a two-component developer comprising toner and carrier
JP2006078809A (ja) * 2004-09-10 2006-03-23 Ricoh Co Ltd 定着装置及び画像形成装置
JP4451256B2 (ja) * 2004-09-13 2010-04-14 株式会社リコー 画像形成装置
JP4364759B2 (ja) * 2004-09-17 2009-11-18 株式会社リコー トナー、トナー収納容器、トナー補給装置及び画像形成装置
EP1806626A4 (fr) * 2004-09-27 2012-08-15 Dainippon Ink & Chemicals Nigrosine modifiee et procede de fabrication de ladite nigrosine, et toner de developpement d'image a charge electrostatique utilisant ladite nigrosine modifiee
US20060240350A1 (en) * 2005-04-22 2006-10-26 Hyo Shu Developer, and image forming apparatus and process cartridge using the developer
US8475985B2 (en) * 2005-04-28 2013-07-02 Xerox Corporation Magnetic compositions
US8080357B2 (en) * 2006-01-30 2011-12-20 Nippon Chemical Industrial Co., Ltd. External additive for toner and method for producing the same
JP2007310353A (ja) * 2006-04-17 2007-11-29 Ricoh Co Ltd 定着装置及び画像形成装置
US7764887B2 (en) * 2006-04-26 2010-07-27 Ricoh Company, Limited Developing device and image forming apparatus
US8084179B2 (en) * 2006-09-04 2011-12-27 Ricoh Company, Ltd. Electrostatic image developing toner having specific variation coefficient of number distribution, two-component developer, image forming method and process cartridge
JP2008116580A (ja) * 2006-11-01 2008-05-22 Ricoh Co Ltd 画像形成用トナー、トナー供給方法及びプロセスカートリッジ
JP4662958B2 (ja) * 2007-03-05 2011-03-30 株式会社リコー トナー及び二成分現像剤
JP5049710B2 (ja) * 2007-09-13 2012-10-17 株式会社リコー 画像形成装置及びこれに用いる現像装置
JP5006145B2 (ja) * 2007-09-19 2012-08-22 株式会社リコー 現像剤規制部材の製造方法
JP5252180B2 (ja) 2008-01-09 2013-07-31 株式会社リコー 静電荷像現像用トナー及び画像形成方法
JP2010002613A (ja) * 2008-06-19 2010-01-07 Oki Data Corp 現像装置および画像形成装置
US8099026B2 (en) * 2008-07-31 2012-01-17 Ricoh Company, Limited Development device and image forming apparatus capable of reducing stress applied to developer
JP2012032774A (ja) 2010-07-07 2012-02-16 Ricoh Co Ltd 電子写真画像形成方法及びプロセスカートリッジ
RU2664773C1 (ru) 2014-09-17 2018-08-22 Рикох Компани, Лтд. Проявляющее устройство и устройство формирования изображения
JP2022158083A (ja) 2021-04-01 2022-10-14 株式会社リコー 画像形成装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6002903A (en) 1995-05-15 1999-12-14 Canon Kabushiki Kaisha Toner for developing electrostatic image, apparatus unit and image forming method
US20010006583A1 (en) 1999-12-13 2001-07-05 Ricoh Company, Ltd Image forming method

Family Cites Families (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US241977A (en) * 1881-05-24 William halkyaed
US228607A (en) * 1880-06-08 Door-hanger
US6168894B1 (en) 1995-09-14 2001-01-02 Ricoh Company, Ltd. Image forming method and dry toner therefor
US5832354A (en) 1995-12-05 1998-11-03 Ricoh Company, Ltd. Image fixing device, image forming apparatus providing the image fixing device and rotor used in the image fixing device and having induction coil inside
US5912100A (en) 1996-01-31 1999-06-15 Ricoh Company, Ltd. Toner for developing electrostatic images
GB2319583B (en) 1996-11-25 1999-09-22 Ricoh Kk Device with induction heating roller
US6146804A (en) * 1997-04-03 2000-11-14 Minolta Co., Ltd. Electrophotographic liquid developer and image forming apparatus
JPH1144970A (ja) 1997-05-28 1999-02-16 Ricoh Co Ltd 静電荷像現像用乾式現像剤
EP0930545A3 (fr) 1998-01-16 2001-08-29 Ricoh Company, Ltd. Méthode de formation d'image utilisant des toners colorés
JP3997025B2 (ja) 1998-03-31 2007-10-24 株式会社リコー 定着装置
GB2337607B (en) 1998-05-21 2002-10-23 Ricoh Kk Image forming method and dry toner therefor
EP0961175B1 (fr) * 1998-05-26 2006-01-25 Canon Kabushiki Kaisha Révélateur ayant l' aptitude à être chargé négativement par voie triboélectrique et procédé de production d' images
US6096468A (en) * 1998-06-05 2000-08-01 Canon Kabushiki Kaisha Toner, toner production process, and image forming method
JP3559716B2 (ja) 1998-09-25 2004-09-02 株式会社リコー 誘導発熱型定着装置とその誘導電流発生部材を製造する方法
EP0992859B1 (fr) 1998-10-06 2008-03-26 Ricoh Company, Ltd. Méthode électrostatique de formation d'images
US6060201A (en) 1998-10-21 2000-05-09 Ricoh Company, Ltd. Image forming method using color developers
ES2223399T3 (es) 1999-01-29 2005-03-01 Ricoh Company, Ltd. Toner electrografico y metodo de formacion de imagen usando el toner.
JP3770746B2 (ja) * 1999-03-01 2006-04-26 富士ゼロックス株式会社 静電荷像現像用トナー、静電荷像現像剤及び画像形成方法
JP2000310877A (ja) * 1999-04-27 2000-11-07 Minolta Co Ltd トナージェット用トナー
JP2000310917A (ja) 1999-04-28 2000-11-07 Ricoh Co Ltd 誘導加熱型定着装置
JP3767846B2 (ja) 1999-05-28 2006-04-19 株式会社リコー 静電荷像現像用トナー及び画像形成方法
US6403275B1 (en) 1999-08-31 2002-06-11 Ricoh Company, Ltd. Electrophotographic toner, and image forming method and apparatus using the toner
JP2001159857A (ja) 1999-09-21 2001-06-12 Ricoh Co Ltd 誘導加熱定着装置及び画像形成装置
JP2001142248A (ja) 1999-11-12 2001-05-25 Ricoh Co Ltd 中間転写方式画像形成用トナーおよび該トナーを用いた中間転写方式画像形成方法
JP2001305779A (ja) * 2000-04-21 2001-11-02 Fuji Xerox Co Ltd 電子写真用トナー、及びその製造方法、並びに二成分現像剤

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6002903A (en) 1995-05-15 1999-12-14 Canon Kabushiki Kaisha Toner for developing electrostatic image, apparatus unit and image forming method
US20010006583A1 (en) 1999-12-13 2001-07-05 Ricoh Company, Ltd Image forming method

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1522900A1 (fr) * 2003-10-08 2005-04-13 Ricoh Company, Ltd. Toner et révélateur,ainsi que procédé et appareil de production d' images utilisant ledit révélateur
KR100734343B1 (ko) * 2003-10-08 2007-07-03 가부시키가이샤 리코 토너 및 현상제, 상기 현상제를 이용한 화상 형성 방법 및상기 현상제를 포함한 프로세스 카트리지 및 화상 형성 장치
CN100555089C (zh) * 2003-10-08 2009-10-28 株式会社理光 调色剂和显影剂以及使用该显影剂的成像方法和装置
EP1744221A1 (fr) * 2005-07-13 2007-01-17 Ricoh Company, Ltd. Encre en poudre, processus de production de celle-ci et procédé de formation d'image
US7390607B2 (en) 2005-07-13 2008-06-24 Ricoh Company, Ltd. Toner, production process for the same, and image forming method
US7432032B2 (en) 2005-07-13 2008-10-07 Ricoh Company, Ltd. Toner, production process for the same, and image forming method
EP2068198A1 (fr) * 2005-07-13 2009-06-10 Ricoh Company, Ltd. Encre en poudre, processus de production de celle-ci et procédé de formation d'image
EP1764656A1 (fr) * 2005-09-14 2007-03-21 Ricoh Company, Ltd. Toner, procédé de fabrication, procédé de formation d'images l'utilisant, révélateur, récipient de toner, cartouche de traitement et appareil de formation d'images
US7396625B2 (en) 2005-09-14 2008-07-08 Ricoh Company, Ltd. Toner, method for producing the same, and image-forming method using the same

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